20100001122221 has 4 divisors (see below), whose sum is σ = 20186267221692. Its totient is φ = 20013735022752.

The previous prime is 20100001122197. The next prime is 20100001122239. The reversal of 20100001122221 is 12222110000102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6955852386025 + 13144148736196 = 2637395^2 + 3625486^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100001122221 - 2¹⁰ = 20100001121197 is a prime.

It is a super-2 number, since 2×20100001122221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100001122196 and 20100001122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100001122241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43133049386 + ... + 43133049851.

It is an arithmetic number, because the mean of its divisors is an integer number (5046566805423).

Almost surely, 2^{20100001122221} is an apocalyptic number.

It is an amenable number.

20100001122221 is a deficient number, since it is larger than the sum of its proper divisors (86266099471).

20100001122221 is an equidigital number, since it uses as much as digits as its factorization.

20100001122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86266099470.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20100001122221 its reverse (12222110000102), we get a palindrome (32322111122323).

The spelling of 20100001122221 in words is "twenty trillion, one hundred billion, one million, one hundred twenty-two thousand, two hundred twenty-one".